世态炎凉姑娘你得坚强
[shì tài yán liáng gū niáng nĭ dé jiān qiáng]
It means in this indifferent world where people act warmly towards you when you're prosperous but cold when you're down ('worldly indifference'), girls should be strong enough to protect themselves and keep moving forward, which indicates self-encouragement and positive self-motivation under difficulties.